Book holder



FIG. 1 is a perspective view of the book holder showing my new design;

FIG. 2 is a top plan view of FIG. 1;

FIG. 3 is a bottom plan view of FIG. 1;

FIG. 4 is a right side view of FIG. 1;

FIG. 5 is a left side view of FIG. 1;

FIG. 6 is a front view of FIG. 1; and,

FIG. 7 is a back view of FIG. 1.

The broken line rectangles and clock face on the top in FIGS. 1, 2, and 4 to 7 are included for the purpose of showing features that no part of the claimed design. 

The ornamental design for a book holder, as shown and described. 